Microbes make tubular microtunnels on Earth and perhaps on Mars
Tubular microtunnels believed to be the trace fossils formed by microbes inhabiting volcanic rock interiors have only been reported in oceanic and subglacial settings. This is the first observation of such features in basaltic volcanic glass erupted in a continental lake environment, the Fort Rock volcanic field.
|Tubular microtunnels believed to be the trace fossils formed by microbes inhabiting volcanic rock interiors |
have only been reported in oceanic and subglacial settings [Credit: Nikitczuk et al.]
The Fort Rock volcanic field has analogous characteristics to locations found on Mars such as Gale and Gusev crater.
The presence of these features in this new geologic setting may suggest that subsurface microbes or evidence thereof, if present on Mars, could exist nearer to the surface than previously thought. This knowledge can thus aid future Mars missions (e.g., Mars 2020 Project) with goals that include searching out biosignatures and finding suitable rocks for sample return.
The study is published in the Geological Society of America Bulletin.
Source: Geological Society of America [May 7, 2016]